نتایج جستجو برای: tacticity
تعداد نتایج: 109 فیلتر نتایج به سال:
Abstract A perfect isotactic poly(methacrylic acid) ( it ‐PMAA) is synthesized and characterized by NMR spectroscopy. Surface pressure versus mean area per repeat unit π−A ) isotherms are recorded compared with atactic at ‐PMAA). ‐PMAA exhibits a isotherm, indicating the formation of stable Langmuir film. The isotherm has characteristic pseudo‐plateau π ≈11–14 m N −1 attributed to creation worm...
Beside Ziegler-Natta and Phillips catalysts the development of methylaluminoxane (MAO) as cocatalyst in combination with metallocenes or other transition metal complexes for the polymerization of olefins has widely increased the possibilities in controlling the polymer composition, polymer structure, tacticity and special properties with high precision. These catalysts allow the synthesis of is...
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